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SIEMENS D3a / 7721


 
SIEMENS D3a / 7721
High transconductance long-life > 10.000 hours Frame Grid pentode produced for German Post by Siemens. These are triple mica version with gold pins. Can be used in triode connection as a great driver for 2A3 and 300B tubes. More than half of the stock are labeled as Valvo which came in with bulk package.
Quantity in Stock : Out of Stock!
Price : US$31.00/each; US$67.00/matched pair in original box
          US$26.00/each; US$57.00/matched pair in white box         



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